Marine cable knife



May 8, i962 Filed Sept. 8, 1959 Figi INVENTORS HA/zny L. (0H/v /P/cfmka ift/ CoH/V ATTORNEY United States Patent O 3,032,874 MARINE CABLE KNIFE Harry L. Cohn, 1119 Boylston St., Newton Highlands, Mass., and Richard W. Cohn, Newton Centre, Mass. (340 Commonwealth Ave., Newton 67, Mass.)

Filed Sept. 8, 1959, Ser. No. 838,630 3 Claims. (Cl. StL-91) This invention relates to a knife blade for removing woven-metal covering from cable.

For many years, a practical tool has been sought to remove the woven-metal sheath `from marine cable and the like which are often as muchas four inches in diameter. Cutting tools that are used for cutting off insulation (eg. rubber, plastic, cloth, etc.) from ordinary wires and land cables are unsatisfactory for such armored cable. No hand cutting tool is known which can be made as to be effective for such armored cable.

One object of this invention is to provide a novel knife blade which can readily and easily remove a longitudinal strip of the armor and thus permit the remainder to be readily pulled off.

Further objects and a fuller understanding of the inven-tion will hereinafter appear from the following description of a preferred embodiment illustrative of the invention and shown in the accompanying drawings in which:

FIG. l is a side view of the blade inserted in a handle.

FIG. 2 is a top view of cable showing scoring.

FIG. 3 is a top view of cable showing a portion of a strip of armor removed.

FIG. 4 is a section taken on line 4-4 of FIG. 3.

The device consists of a stripping tool firmly attached on its shank end to a handle. The blade has an elongated stem portion terminating in a U-shaped hook. A double bevel scoring edge is provided along the inner side of the stem. Within the U-hook there is a double bevel cutting guide edge which is an extension of the scoring edge. Transverse to this edge is a sli-tting edge, the bevel sides of which preferably form an angle smaller than the angle between the bevel sides of the cutting lguide edge. EX- tending from the other end of the slitting edge is another short cutting guide edge extending approximately to the end of the hook.

Referring to the drawings, the device therein shown as illustrative of one embodiment of our invention comprises a cutting tool for removing woven wire armor from an insulated cable. It consists of a blade 1)` having a shank portion 11 to be firmly tixed in or clamped by a handle 12. The blade has four double bevel edge portions. The edge of stem portion 13 is Iused for scoring and cutting the armor in order to start and then to complete the cutting operation. Edge 14 with edges 15 and 16 as guide cutters is operable to cut a strip of the armor 17 from cable 18 exposing the outer electrical insulation 19 surrounding the electrical conductors 20.

Edge 14 is a straight edge substantially perpendicular to edges and 16.

In operation, a transverse scoring and starting cut 21 is made by edge 13. With the blade 10 placed flat against the cable and with edge 14 facing the operator and engaged with the portion of the armor slightly raised at cut 21, the handle is pulled towards the operator. The edge 14 with guide cut-ters 15 and 16 cut a strip of armor 22 away from the insulation 19 and all the way to the free ICC end of the cable 23. The remaining armor in the cut portion is bent back and removed by complete scoring around the cable at 21.

`instead of cutting towards a -free end, another complete scoring around the cable may be used as a termination point for the armor strip to be removed.

The end of the hook is rounded to prevent it from digging into the armor and to also protect the operator in case of a slip of the knife. The blade is preferably fabricated from high carbon, high chrome rust resistant steel.

While the preferred embodiment of our invention has been described in detail, it will be understood that we do not wish to be limited to the particular construction set forth, since various changes in the form, material, proportions and arrangement of parts, and in the details of construction may be resorted to without departing from the spirit and scope of the invention, or destroying any of the advantages contained in the same, heretofore described and defined in the following claims.

We claim:

1. A stripping tool comprising an elongated blade body equipped with a handle at its inner end and terminating at its outer end in a U-shaped hook; said blade body having a longitudinal scoring edge on its stem extended by a guiding longitudinal edge, a transverse cutting edge and another guiding cutting longitudinal edge; said transverse edge and said longitudinal edges being positioned on the inner portion of said U-hook; said longitudinal edges being substantially parallel said transverse cutting edge being a straight edge substantially perpendicular to said guiding edges.

2. A stripping tool consisting of an elongated blade body equipped with a handle at its inner end and terminating at its outer end in a `U-shaped hook; said blade body having a longitudinal scoring edge on its stem extended by a guiding longitudinal edge, a transverse cut ting edge and another guiding cutting longitudinal edge; said transverse edge and said longitudinal edges being positioned on the inner portion of said U-hook; said longitudinal edges being substantially parallel; all said edges being beveled; the angle between the bevel sides of the cutting edge of said transverse edge being smaller than the angle between the bevel sides of the edge of said longitudinal edges, said transverse cutting edge being a staight edge substantially perpendicular to said guiding e ges.

3. A cable knife blade having an elongated stem portion terminating in a U-shaped hook, comprising a shank portion and a body portion; said body portion having a longitudinal scoring edge, and a transverse cutting edge extended on either end by a substantially longitudinal guide cutting edge; said transverse and longitudinally guide cutting edges being positioned on the inner edge of the U-hook, the end of said hook being rounded, said transverse cutting edge being a straight edge substantially perpendicular to said -guiding edges.

References Cited in the tile of this patent UNITED STATES PATENTS 318,211 Seaman May 19, 1885 1,187,386 Pehrson June 13, 1916 1,546,975 Feller July 21, 1925 2,348,429 Walker May 9, 1944 

